Booksy
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I'm assuming he means Psychokinetic from Psionics Unleashed (by Dreamscarred Press) which is like flaming, but adds 1d4 ectoplasmic damage, which apparantly bypasses all DR.
If by 'stack' do you mean can a - for example - Medium Psychokinetic Longbow, 1d8+1d4e, have Gravity Bow cast upon it, thus changing its damage to 2d6+1d4e? Then absolutely.
If by 'stack' are you asking does Gravity Bow also 're-size' the base dice damage of the enchantment? Not a chance in Tartarus.
The weapon enchantment has nothing to do with size, it has the same affect when cast on a weapon of any size (good for <M creatures, not so much for >M)